cloud-haskell
Workflow
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| cloud-haskell | Workflow | |
|---|---|---|
| - | 1 | |
| 72 | 42 | |
| - | - | |
| 0.0 | 0.0 | |
| over 5 years ago | almost 8 years ago | |
| Haskell | ||
| BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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cloud-haskell
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Tracking mentions began in Dec 2020.
Workflow
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Event Sourcing
I was part of that debate, I remember a rather interesting point of discussion: Is the main operation "apply" or "dedup"
Apply seems to be the common notion of event sourcing: There is a function apply that takes a state an event and yields a new state. Then, starting in an init state and iteratively applying the entire event history, boom, latest state restored.
Dedup has a lot of charm though: Run and rerun your code, if that step of your code is executed for the first time (no corresponding event in the event history) execute the step and store its result as an event in the history, however, if that step of your code is executed for the second, third time (there is a corresponding event in the event history) do not execute the step and return its result from the event in the history. The Haskell Workflow Package (https://hackage.haskell.org/package/Workflow) is a good example
Temporal follows the second approach, so "proper" Event Sourcing? You be the judge :)
What are some alternatives?
unpack-funcs - Unpacking reader monad transformers in Haskell
unliftio - The MonadUnliftIO typeclass for unlifting monads to IO
lens-tutorial - The missing tutorial module for the lens library
effect-monad - Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.
basic-prelude - An enhanced core prelude, meant for building up more complete preludes on top of.
record - Anonymous records
abstract-par
recursion-schemes - Generalized bananas, lenses and barbed wire
rio-orphans - A standard library for Haskell
hask - Category theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)
monad-time